diff --git a/hw/virtio-net.c b/hw/virtio-net.c
index 663f33c..573c669 100644
--- a/hw/virtio-net.c
+++ b/hw/virtio-net.c
@@ -73,7 +73,7 @@ typedef struct VirtIONet
     int multiqueue;
     uint16_t max_queues;
     uint16_t curr_queues;
-    int config_size;
+    size_t config_size;
 } VirtIONet;
 
 /*